Without remote is not possible. Any way try press and hold the power bottom on the projector About 4 seconds while projector is in standby mode . Not sure it will work but you can make a try.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.
http://electro-medical.blogspot.com/
SOURCE: Resetting the air filter timer
If you do not have a remote here is how to reset the filter time. Use the "Menu" bottun to get the "easy menu" to display. Push the down arrow until you get to "Filter Time," then push and hold the RIGHT arrow to reset the filter time. DO NOT try to reset using the "Reset" option on the easy menu, it will not work.
SOURCE: Preylahong NEC MT830+need help to reset new lamp
After replacing lamp in MT-830(NEC) press and hold "on" button for 10 seconds to reset lamp hours. If projector has beyond 2100 hours press the "off" button for 10 second.
SOURCE: NEC VT47 Lamp type VT70LP will not power up 2 red lights spear Lamp not working
When the lamp exceeds 2100hoursof service, the projector cannot turn on and the manu is not displayed. Do the following:
For VT670/VT470 Press the help button on the remote control for a minimum of ten seconds.
For VT570/VT47 Press and hold the power and the exit buttons on the remote control simultaneously for a minimum of ten seconds. When the lamp time clock is reset to zero, the lamp indicator goes out. Hope this helps! :]
SOURCE: How to reset Time clock on NEC MT830+ Projector
change the lamp even if the old lamp
use original nec remote contro
l6. After you install a new lamp, select the lamp Usage icon and press and hold
the "Power On" button on the remote control for ten seconds to reset the
lamp time clock to zero.
NOTE: If resetting the lamp clock back to zero after 2100 hours of service,
press the "Power Off" (not "Power On") button on the remote control for ten
seconds
SOURCE: blue haze in top right of screen from NEC mt1075 projector
the light filter on the blue lcd panel is fried due to excessive dust and heat. clean out the projector with canned air. unfortunately, you cannot buy individual parts of the optical engine- you'll have to replace the whole thing. or live with it.
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